<template>
	<view>
		<!-- 使用自定义搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
		<my-search ref="searchContainer" @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧滑动区 -->
			<scroll-view class="left-scroll-view"scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>

			</scroll-view>
			<!-- 右侧滑动区 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<!-- 二级标题区域 -->
				<view class="right-lv2" v-for="(item2, i) in cateLevel2" :key="i" v-if="item2.children">
					<view class="level2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类区域 -->
					<view class="right-lv3">
						<!-- 三级分类的item -->
						<view class="level3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
							<image :src="item3.cat_icon" mode=""></image>
							<text>{{item3.cat_name}}</text>
							
						</view>
						
					</view>
					
				</view>

			</scroll-view>
		</view>
		
	</view>
</template>

<script>
	import MySearchContainer from '../../uni_modules/my-search/components/my-search/my-search.vue';
	import badgeMix from '@/mixins/tabbar-badge.js';
	
	export default {
		mixins: [badgeMix],
		components: {
		    MySearchContainer
		  },

		data() {
			return {
				// 当前设备可用高度
				wh: 0,
				cateList: [],
				active: 0,
				// 二级分类列表
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			// const sysinfo = uni.getSystemInfoSync()
			// // console.log(sysinfo)
			// this.wh = sysinfo.windowHeight

			this.getCateList()
		},
		
		mounted() {
			const sysinfo = uni.getSystemInfoSync()
		    // console.log(this.$refs.searchContainer.height); // 获取 height
			try {
				  if (this.$refs.searchContainer.height) {
					  this.wh = sysinfo.windowHeight - this.$refs.searchContainer.height;
				  }
			  } catch (error) {
				  console.log("没有获取到搜索组件高度！");
			}
			  
		},
		
		methods: {
			async getCateList() {
				const {data: res} = await uni.$http.get('/api/public/v1/categories')
				console.log(res)
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				
				
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			
			activeChanged(i) {
				this.active = i
				
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children 
				
				// 重置右侧滑动区域的scrollTop的值
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			
			// 从三级图片跳转到列表详情页
			gotoGoodList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left-scroll-view {
		width: 200rpx;
	}

	.left-scroll-view-item {
		background-color: #F7F7F7;
		line-height: 120rpx;
		text-align: center;
		font-size: 25rpx;
		
		&.active {
			background-color: #FFFFFF;
			position: relative;
			
			&::before {
				content: ' ';
				display: block;
				width: 4.5rpx;
				height: 45rpx;
				background-color: #C00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	} 
	
	.level2-title{
		font-size: 25rpx;
		font-weight: bold;
		text-align: center;
		padding: 20rpx 0;
		margin-bottom: 25rpx;
	}
	
	.right-lv3 {
		display: flex;
		flex-wrap: wrap;
		.level3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 20rpx;
			image {
				width: 150rpx;
				height: 150rpx;
			}
			text {
				font-size: 25rpx;
			}
		}
	}
</style>
